Incremental printing of symbolic information – Ink jet – Controller
Patent
1994-10-13
1997-05-06
Fuller, Benjamin R.
Incremental printing of symbolic information
Ink jet
Controller
347 23, 347 42, B41J 29393
Patent
active
056275714
ABSTRACT:
A maintenance system for an ink jet printer of the type having a full width array printhead has a movable carriage with a droplet sensor and a nozzle recovery device. As the carriage moves along the length of the printhead, each nozzle checked, one at a time, by the droplet sensor for the presence or absence of an ejected droplet and if the droplet has the correct directionality. Any problem nozzle is identified during a single traversal of the carriage across the printhead, and during a second traversal, the identified problem nozzles have a recovery operation performed on them such as being cleaned to remove any dried ink or other contaminating particles or being primed in the case of a clogged nozzle. The problem nozzles which have had a recovery operation performed on them and checked again by the droplet sensor is required for the entire array of nozzles, and ink is conserved since only predetermined nozzles are printed.
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Anderson David G.
Claflin Alfred J.
Hubble, III Fred F.
Martin James P.
Fuller Benjamin R.
Hallacher Craig A.
Xerox Corporation
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